ip monitor: Dont print timestamp or banner-label for cloned routes

ip monitor: Dont print timestamp or banner-label for cloned routes

This is ugly fix but solves the case when timestamp
or banner-label is printed before the cloned route will be skipped
by iproute filter which filters out all cached routes by default.
In such case timestamp will be printed twice:

    Timestamp: Thu Sep  4 19:46:59 2014 457933 usec
    Timestamp: Thu Sep  4 19:47:07 2014 977970 usec
    10.3.5.1 dev wlp3s0 lladdr XX:XX:XX:XX:XX:XX STALE

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>